Git commits in Moodle 3.3.5 by Carlos

commit c4f22db3151b939d2a0ad024ff2948b6ee10b016
Author: Carlos <carlos.escobedo@gmail.com>
Date:   Thu, 22 Feb 2018 17:53:51 +0800
Tag:    v3.3.5

MDL-60547 message_popup: adding preventDefault at notification popover